PORIFERA. III. 113 



10. Surface with low warts or long papillae 1 1. 



Surface simple 12. 



11. Surface with low warts, dermal strongyla long and straight verrucosa 



Surface with long papillae, dermal strongyla robust with a double curvature. .. filifera Schmidt 



12. The acanthostyli only spined on the head norvegica Thiele. 



- The acanthostyli spined in the iower half part mollis 



13. The chelae strongly, nearly semicircularly curved curvichela 



The chelae less strongly curved 14. 



14. The dermal spicules polytylote, chelae large, 0-052 0-064 mm , the end-parts some- 

 what recurved rugosa 



- The dermal spicules not polytylote, chelae smaller 15. 



15. The acanthostyli strongly spined in the whole length splenium 



The acanthostyli not entirely spined 16. 



16. The large acanthostyli spined towards the apex, chelae 0-032 o-o^y 1 "", the free 



part of the shaft about one third of the length tenuicula 



- The large acanthostyli at most spined in the lower half part 17. 



17. The small acanthostyli distinctly curved 18. 



The small acanthostyli straight 19. 



18. The acanthostyli reaching to o-65 mm , chelae somewhat strongly curved, 0-035 o - O44 mm similis 



The acanthostyli reaching to 0-42 mm , chelae less curved, 0-037 mm pauper tas Bow. 



19. The acanthostyli long, reaching to 0-95 mm , the dermal spicules slightly tending 



towards tornota nummulus 



The acanthostyli shorter, the dermal spicules pure strongyla 20. 



20. The acanthostyli reaching to 0-63 mm , the dermal strongyla 0-35 0-52 mm , surface 



with papillae stylata 



The acanthostyli reaching to 0-38""", the dermal strongyla 0-26 0-32 mm , surface 

 simple dubia 



21. The dermal spicules diactinal (at all events not distinctly monactinal) 22. 



The dermal spicules monactinal 42. 



22. The dermal spicules tornota 23. 



The dermal spicules oxea or tylota 32. 



23. The dermal spicules centrotylote tornota land/era Tops. 



The dermal spicules not centrotylote 24- 



24. The tornota with unequal ends 25. 



The tornote with equal ends 26. 



25. The large acanthostyli only spined at the base, 0-24""", chelae o-oi8 ram prostrata Thiele. 



The large acanthostyli a little more spined, 0-45 mm , chelae 0-03 mm Peachii Bow. 



26. The large acanthostyli spined in about the whole length 27. 



The large aoanthostyli spined only near the base 31. 



27. The chelae of ordinary shape 28. 



The chelae extraordinxily flat platychcla 



28. Surface with papillae, tornota 0-36 mm , chelae 0-024""" tnammitlarisFrstcit. 



Surface simple 29. 



29. The acanthostyli reaching to 0-53 ram , the tornota 0-17 0-22 mm , chelse with slightly 



recurved end-parts 0-021 0-054 v " m perforata 



The acanthostyli not reaching oyer o - 35 mm 30. 



The Ingolf-Eipedition. VI. 3 15 



